00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In this question we're going to discuss about the z score.
00:09
Let me remind to you that if x followed by the normal distribution with the mean and the standard deviation and then the z score denoted by z equal to the x minus the mean of a standard deviation.
00:27
Now for the question a, we see x equal followed by the normal, with the mean equal to the 124, standard division equal to the 7.
00:38
The question asked, i need to find the z score on the x, z, it will equal to the x equal to the 79 now.
00:50
So therefore, we have the 79, we minus the mean.
00:53
On with the standard deviation, if we compute it, we should get equal to the minus 6 .4.
01:06
And then we want to round to the, i will write to the four decimal places here, to a sixth.
01:13
That will be the answer for the question a.
01:16
Now for the question b, we will have x followed by the normal with the mean equal to the 102, standard division equal to the sixth.
01:26
And then again, the z score for the x equal to one, two, three.
01:33
We think we minus the mean, our standard deviation...